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Diffstat (limited to 'mpc/src/pow_z.c')
-rw-r--r-- | mpc/src/pow_z.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/mpc/src/pow_z.c b/mpc/src/pow_z.c new file mode 100644 index 0000000000..22eb544ca9 --- /dev/null +++ b/mpc/src/pow_z.c @@ -0,0 +1,47 @@ +/* mpc_pow_z -- Raise a complex number to an integer power. + +Copyright (C) 2009, 2010 INRIA + +This file is part of GNU MPC. + +GNU MPC is free software; you can redistribute it and/or modify it under +the terms of the GNU Lesser General Public License as published by the +Free Software Foundation; either version 3 of the License, or (at your +option) any later version. + +GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS +FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for +more details. + +You should have received a copy of the GNU Lesser General Public License +along with this program. If not, see http://www.gnu.org/licenses/ . +*/ + +#include "mpc-impl.h" + +int +mpc_pow_z (mpc_ptr z, mpc_srcptr x, mpz_srcptr y, mpc_rnd_t rnd) +{ + mpc_t yy; + int inex; + mpfr_prec_t n = (mpfr_prec_t) mpz_sizeinbase (y, 2); + + /* if y fits in an unsigned long or long, call the corresponding functions, + which are supposed to be more efficient */ + if (mpz_cmp_ui (y, 0ul) >= 0) { + if (mpz_fits_ulong_p (y)) + return mpc_pow_usi (z, x, mpz_get_ui (y), 1, rnd); + } + else { + if (mpz_fits_slong_p (y)) + return mpc_pow_usi (z, x, (unsigned long) (-mpz_get_si (y)), -1, rnd); + } + + mpc_init3 (yy, (n < MPFR_PREC_MIN) ? MPFR_PREC_MIN : n, MPFR_PREC_MIN); + mpc_set_z (yy, y, MPC_RNDNN); /* exact */ + inex = mpc_pow (z, x, yy, rnd); + mpc_clear (yy); + return inex; +} + |